Classes with only one instance

[Henri Manson]

I have the following proposal to change classes with only one instance e.g. ScreenManager as follows (an example):

 

class InstanceClass
{
public:
 int x;
 int y;

 

 static InstanceClass instance;

 

 InstanceClass() : x(3), y(4) { }
 ~InstanceClass()
 {
  printf("cleaning up\n");
 }
};

 

InstanceClass InstanceClass::instance;

int main(int argc, char* argv[])
{
 printf("%d %d \n", InstanceClass::instance.x, InstanceClass::instance.y);
 return 0;
}

 

 

The advantages are:

- No more need to implement init/deinit functions: the object is automatically destroyed at program exit

- A direct object -> (slightly) better performance

 

I'm very curious what your opinion is.

This compiles under gcc and VC++